In this paper we improve and extend to higher order corrections the strict bound obtained by Spedicato and Burmeister for theconditionnumberofpositivedefinitematricesbordered by an extra row and column.
We consider the problem of characterizing entrywise functions that preserve the cone ofpositivedefinitematrices when applied to every off-diagonal element. Our results extend theorems of Schoenberg [Duke Math. J. 9], Rudin [Duke Ma...
A promising approach to solving sparse systems of equations involves creating an augmented system that is symmetric quasi-definite. The attraction of th...
A promising approach to solving sparse systems of equations involves creating an augmented system that is symmetric quasi-definite. The attraction of th...
Summary: The algebraic multilevel iteration method is a recursively defined method to construct spectrally equivalent preconditioners to a sequence of s...
p/ pWe present some lower bounds for the Frobenius conditionnumberof a positivedefinitematrix depending on trace, determinant, and Frobenius norm of...